[2021] day 8 python
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.gitignore
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.gitignore
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### VirtualEnv template
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# Virtualenv
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# http://iamzed.com/2009/05/07/a-primer-on-virtualenv/
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.Python
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[Bb]in
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[Ii]nclude
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[Ll]ib
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[Ll]ib64
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[Ll]ocal
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[Ss]cripts
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pyvenv.cfg
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.venv
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pip-selfcheck.json
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### Example user template template
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### Example user template
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# IntelliJ project files
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.idea
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*.iml
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out
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gen
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### Python template
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# Byte-compiled / optimized / DLL files
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__pycache__/
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*.py[cod]
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*$py.class
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# C extensions
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*.so
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# Distribution / packaging
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build/
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develop-eggs/
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dist/
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downloads/
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eggs/
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.eggs/
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lib/
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lib64/
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parts/
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sdist/
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var/
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wheels/
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share/python-wheels/
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*.egg-info/
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.installed.cfg
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*.egg
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MANIFEST
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# PyInstaller
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# Usually these files are written by a python script from a template
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# before PyInstaller builds the exe, so as to inject date/other infos into it.
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*.manifest
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*.spec
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# Installer logs
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pip-log.txt
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pip-delete-this-directory.txt
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# Unit test / coverage reports
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htmlcov/
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.tox/
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.nox/
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.coverage
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.coverage.*
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.cache
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nosetests.xml
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coverage.xml
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*.cover
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*.py,cover
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.hypothesis/
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.pytest_cache/
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cover/
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# Translations
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*.mo
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*.pot
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# Django stuff:
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*.log
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local_settings.py
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db.sqlite3
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db.sqlite3-journal
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# Flask stuff:
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instance/
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.webassets-cache
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# Scrapy stuff:
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.scrapy
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# Sphinx documentation
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docs/_build/
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# PyBuilder
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.pybuilder/
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target/
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# Jupyter Notebook
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.ipynb_checkpoints
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# IPython
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profile_default/
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ipython_config.py
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# pyenv
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# For a library or package, you might want to ignore these files since the code is
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# intended to run in multiple environments; otherwise, check them in:
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# .python-version
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# pipenv
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# According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
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# However, in case of collaboration, if having platform-specific dependencies or dependencies
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# having no cross-platform support, pipenv may install dependencies that don't work, or not
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# install all needed dependencies.
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#Pipfile.lock
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# PEP 582; used by e.g. github.com/David-OConnor/pyflow
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__pypackages__/
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# Celery stuff
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celerybeat-schedule
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celerybeat.pid
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# SageMath parsed files
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*.sage.py
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# Environments
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.env
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env/
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venv/
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ENV/
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env.bak/
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venv.bak/
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# Spyder project settings
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.spyderproject
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.spyproject
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# Rope project settings
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.ropeproject
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# mkdocs documentation
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/site
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# mypy
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.mypy_cache/
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.dmypy.json
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dmypy.json
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# Pyre type checker
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.pyre/
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# pytype static type analyzer
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.pytype/
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# Cython debug symbols
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cython_debug/
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@ -15,7 +15,6 @@ def solve2() -> int:
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))
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if __name__ == '__main__':
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print(solve1()) # 1766
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print(solve2()) # 1797
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@ -67,7 +67,6 @@ def solve1_np() -> int:
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return sum(binary * decimalize) * sum(invert * decimalize)
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if __name__ == "__main__":
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print(solve1()) # 4001724
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print(solve2()) # 587895
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@ -1,7 +1,7 @@
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import numpy as np
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def loader_np() -> np.ndarray:
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def loader_np():
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with open('../.input/day04', 'r') as f:
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data = f.read().splitlines()
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@ -1,7 +1,7 @@
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from typing import Tuple
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from functools import reduce
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def load() -> list[Tuple[list[str], list[str]]]:
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def load() -> list[tuple[list[str], ...]]:
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with open('../.input/day08', 'r') as f:
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return [tuple(map(str.split, line.split('|'))) for line in f.read().splitlines()]
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@ -13,5 +13,100 @@ def solve1() -> int:
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)
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A = 0b0000001
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B = 0b0000010
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C = 0b0000100
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D = 0b0001000
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E = 0b0010000
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F = 0b0100000
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G = 0b1000000
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n_to_s = {
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0: A | B | C | E | F | G,
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1: C | F,
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2: A | C | D | E | G,
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3: A | C | D | F | G,
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4: B | C | D | F,
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5: A | B | D | F | G,
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6: A | B | D | E | F | G,
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7: A | C | F,
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8: A | B | C | D | E | F | G,
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9: A | B | C | D | F | G,
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}
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s_to_n = {
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A | B | C | E | F | G: 0,
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C | F: 1,
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A | C | D | E | G: 2,
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A | C | D | F | G: 3,
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B | C | D | F: 4,
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A | B | D | F | G: 5,
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A | B | D | E | F | G: 6,
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A | C | F: 7,
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A | B | C | D | E | F | G: 8,
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A | B | C | D | F | G: 9,
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}
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possible = {
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2: n_to_s[1],
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3: n_to_s[7],
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4: n_to_s[4],
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}
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def negate(string: str):
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return list(filter(lambda x: x not in string, "abcdefg"))
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def check_pattern(pattern: list[str], mapping: dict[str, int]):
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def check_legal(_str: str):
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return reduce(lambda a, c: a | mapping[c], _str, 0) in s_to_n
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return all(map(check_legal, pattern))
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def find_mapping(pattern: list[str]):
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domains = {
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char: 0b1111111
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for char in 'abcdefg'
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}
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# remove obvious impossible choices
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for activation in pattern:
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length = len(activation)
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if length in possible:
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for char in activation:
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domains[char] &= possible[length]
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for char in negate(activation):
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domains[char] &= ~possible[length]
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# bruteforce search
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search: list[dict[str, int]] = [{}]
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for char, domain in domains.items():
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deeper = []
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for i in range(7):
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if domain & (1 << i):
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for s in search:
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new = s.copy()
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new[char] = (1 << i)
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deeper.append(new)
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search = deeper
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for mapping in search:
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if check_pattern(pattern, mapping):
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return mapping
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def string_to_int(string: str, mapping: dict) -> int:
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return s_to_n[reduce(lambda a, c: a | mapping[c], string, 0)]
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def solve2() -> int:
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return sum(
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reduce(lambda a, c: a * 10 + string_to_int(c, find_mapping(pattern)), output, 0)
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for pattern, output in load()
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)
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if __name__ == '__main__':
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print(solve1()) #
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print(solve1()) # 301
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print(solve2()) # 908067
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